My bad I meant near Infinite (Demon hawk got that term stuck in my head) or a lot. Madara should have an unmeasurable amount of chakra like the Juubi, not infinite but a hell of a lot. While Madara can absorb some chakra of Shin: Jukai Koutan's roots if he runs out of chakra.
Really, me? But yeah, I do use that term to quantify Madara's chakra levels, but I do know they aren't infinite considering Kaguya who had even more chakra was out of it at occasions. It's just expressive, rather than resolute.
Well okay cant really argue with that other than I dont think juubi chakra can really evolve since it is basically nature energy. I think only his skill and knowlegde of his own power would grow. Same with Adult Sasuke. His chakra isnt gettin any bigger its all up to his visual prowess and physical attributes, overall skill and knowledge
Well, that's arguable. Madara's chakra is a different deal since it can be considered to be of fixed power (I'll talk about this, it's debatable). But Sasuke's chakra is not of fixed power. It constantly progresses and increases in quantity and quality until it reaches its full potential power.
Now coming back to Madara's chakra. Regular jin's bijuus have chakra at constant power, further progression is made by the user's own chakra (if possible). But Madara is a Juubi Jin (different from regular jins), so that chakra and power he gains simply isn't stored inside of him and available on demand like other jinchuurikis but rather its permanent and the chakra is essentially made into the Jin's own chakra acting like the user's own chakra and presumably attaining the same principles and characteristics like every other personally belonged chakra should have. So logically, it should also have the progression aspect of any other chakra. Though again, that's debatable. But logically, it should be true.
Masdara had to be mid 30s when he was brought back, I don't see how his chakra is growing anymore... The reason he was stronger than teen sasuke is because he was in his prime and Sasuke hadn't reached that yet.
Chakra development has nothing to do with age. It progresses due to its development potential i.e its maximum capacity of blossoming to its strongest level. Even if you receive a new chakra at 40, you still have the capacity to develop it just like a 20 year old.