In theory there is no reason why not, and it would be illegal for an employer in the UK to discriminate against you on the basis of age but ..... I've got >4,000hrs TT, the majority day VFR instructing, all the required boxes ticked, have applied to all the usual suspects and haven't got anywhere.
It's impossible to say whether the fact I am 50 years old is the problem or if there is something else in my profile which is causing them to turn me down - a sample size of 1 is never going to be representative. Fortunately for me I already have a great flying job so it really isn't a big deal (maybe that is why they don't want me!).
Good luck if you decide to go for it!