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Do you have a citation on this? Or is it as you say just obvious?

Here’s a study that found no link between age and a slow down of ability to learn things:

https://www.ncbi.nlm.nih.gov/labs/pmc/articles/PMC4552811/#i...

And here’s Harvard’s thoughts on it:

https://www.health.harvard.edu/mind-and-mood/how-memory-and-...

Scientists used to think that brain connections developed at a rapid pace in the first few years of life, until you reached your mental peak in your early 20s. Your cognitive abilities would level off at around middle age, and then start to gradually decline. We now know this is not true.