Like said Dave, there's not a lot you can do about it.
Just go with it mate and wear a cap
I used to have hair down to my ar$e up to my late 20s.........now look at me!
I just keep what's left, cut really short. Saves a fortune on shampoo
Don't let it bother you, it never did me.........even all the slaphead jokes which, I still get now!!!!
And don't forget, all the girls you were pulling with your punk look will have grown up and may now prefer a more mature look!
All the girls love a baldy
You could also go for the badass look......shaved head with goaty type beard.