I don't have a problem with age limits if based on scientific and statistical evidence. What annoys me particularly is the inconsistencies. No you can't fly public transport after 65. Yes you can instruct newby pilots who have never been in an aircraft before (whats the difference from paying passengers?). Yes you can examine pilots for their commercial licences but you have to maintain a Class One medical with the extra expenses like stress ECG's at about £400 a throw. Yes you can examine commercial and private pilots for their recurrent LPC's (licence proficiency checks) and renewals. No you can't examine commercial pilots for their OPC's (which have the same content). Why not? Because one is under Schedule 8 (licensing) and the other comes under Schedule 9 (public transport) of the ANO.
Subside into corner muttering and sucking thum.