hi SD,
never say never....but.....
if you want to then do...but since you're asking for comments to help you in your decision and please do'nt take this as throwing cold water on your idea...
i have been flying 43 years, instructing 20 and examining 6..it has given me great pleasure and enjoyment and i highly recommend it to anyone who has the ambition to teach flying...but...i am 60 this year and doing it a bit less that i did. in addition you have to pass and pay for a class 1 medical every year ( to be changed now to 2 years under 60 ) but like myself you wo'nt benefit from that.
is it really worth the expense at your age...?.. i doubt it.
is it worth the grief of having to study again..?..i doubt it.
is it worth the fun of all the flying..yes...but thats two no's and one yes
on balance if it were me i doubt i would do it.
why not continue with what you are obviously good at...gliding...and tug flying...for as long as you can / wish...and get the fun and enjoyment you must from that.
whatever your choice i wish you many hours of enjoyment.
good luck
the dean.