I don't see age as a problem, at least before senility/medical problems set in.
My wife and I both started PPL training at 50, went on to other ratings and flying is our main hobby now, and is great fun allowing us to travel without the family issues which younger people may have.
Older people may well take longer to master the mechanics of accurate flying and struggle more with the exam studying. However, there is much more to safe flying than this. Factors like: judgement, (weather decisions, diversions, acceptance of situations with one or more bad factors present); prioritising workload (keeping ahead of the aircraft etc) and prudence are not the exclusive province of younger pilots and are more important pilot skills once you have mastered the basics.
So, go on and get your licence. I hope you have as many great airbourne hours as we have had.