I just watched Time Crash again, and I'm not seeing all these wrinkles you're talking about. His face is a bit fuller, and hair is a bit thinner, but, little change other than that. Where are you getting all these wrinkles from? It's been 28 years since Davison was the Doctor and he's barely changed, you will be very lucky to change so little in the next 28 years.
It's worth pointing out that even Time Crash
was made half a decade ago...