I'm only going to address your general question, as I think the hair aspect has been thoroughly covered.
Regarding the general question, I see two sub-questions:
1) Does Data's Body change over time?
The answers already provided are all wonderful, but there is one other point I'd like to make. Observe Data's appearance in Season 1:
and now in Star Trek Nemesis:
Between 2364 and 2379 (15 years), we can see signs that Data has aged. This is more of a visual confirmation of @Jack B Nimble's answer where Geordi briefly mentions that Data does have an ageing subroutine.
So, the answer is YES
2) Does Data need regular care or not?
This is actually addressed in my answer here. To summarise it:
- Data has a bio-mechanical maintenance programme that is 'self-sufficient'
- He is capable of running self-diagnostics
So, he doesn't need regular care - he can perform his own self-maintenance if required; only when something goes seriously wrong does he need to seek help from others.
So, the answer is YES, but only by himself. He doesn't need regular care from other people.