Master Han
Naturally, it varies by area and individual.
Qui Gon Jinn is past his prime by 60, yet Dooku is still growing stronger going well into his 80s. Obi Wan's lightsaber prowess has already declined by the time he's past five decades (partially due to being out of practice), but Windu's is still growing by that age. Presumably, your average Jedi will peak earlier than prodigies such as the above due to having a lower potential ceiling, and lightsaber prowess will peak earlier, once the rate of Force and technical improvements are balanced by age deterioration.
I ask this partially because of the various ridiculously powerful individuals that haven't even passed their 30s yet, making one wonder how powerful they could become in old age. For example:
Revan is...what, twenty something in KotOR? Yet he's already characterized as one of the most powerful Jedi of all time.
Galen Marek is...in his twenties? And he's already stronger in the Force than Vader?
Darth Maul is in his twenties in TPM, yet he's far stronger than Obi Wan is at around the same age.
Or, in the ultimate level of EU haxxx, the future Sith Emperor is already capable of casually mind-raping dark lords of the sith when he's 12 or so years old. He then grows his powers for another century, absorbs the power of hundreds of sith, then grows in power for another millenium, leeches off of Revan and a host of other sources...by this point, he should be reaching Abeloth-levels of power, but he isn't.
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Of course, various factors might result in some adepts advancing/peaking faster than others. Yoda suggests that dark side practitioners grow in power faster than their light side counterparts, and training focused in certain areas would result in cases such as Marek's being stronger than an equivalent aged Anakin in the Force, but an inferior lightsaber duelist. Older characters that have already subconsciously used the Force might advance quicker in the short term, which may explain Bane's prodigious, haxxed upgrades in PoD.
This, however, would not explain how Luke is able to grow powerful enough to challenge Vader with sparse training in between ESB and RotJ, whilst his father, of equal potential, would get tooled by the same Vader after 10 years by AotC.
/rant
Qui Gon Jinn is past his prime by 60, yet Dooku is still growing stronger going well into his 80s. Obi Wan's lightsaber prowess has already declined by the time he's past five decades (partially due to being out of practice), but Windu's is still growing by that age. Presumably, your average Jedi will peak earlier than prodigies such as the above due to having a lower potential ceiling, and lightsaber prowess will peak earlier, once the rate of Force and technical improvements are balanced by age deterioration.
I ask this partially because of the various ridiculously powerful individuals that haven't even passed their 30s yet, making one wonder how powerful they could become in old age. For example:
Revan is...what, twenty something in KotOR? Yet he's already characterized as one of the most powerful Jedi of all time.
Galen Marek is...in his twenties? And he's already stronger in the Force than Vader?
Darth Maul is in his twenties in TPM, yet he's far stronger than Obi Wan is at around the same age.
Or, in the ultimate level of EU haxxx, the future Sith Emperor is already capable of casually mind-raping dark lords of the sith when he's 12 or so years old. He then grows his powers for another century, absorbs the power of hundreds of sith, then grows in power for another millenium, leeches off of Revan and a host of other sources...by this point, he should be reaching Abeloth-levels of power, but he isn't.
------------------
Of course, various factors might result in some adepts advancing/peaking faster than others. Yoda suggests that dark side practitioners grow in power faster than their light side counterparts, and training focused in certain areas would result in cases such as Marek's being stronger than an equivalent aged Anakin in the Force, but an inferior lightsaber duelist. Older characters that have already subconsciously used the Force might advance quicker in the short term, which may explain Bane's prodigious, haxxed upgrades in PoD.
This, however, would not explain how Luke is able to grow powerful enough to challenge Vader with sparse training in between ESB and RotJ, whilst his father, of equal potential, would get tooled by the same Vader after 10 years by AotC.
/rant