Not career advice, but may be of interest to you if you haven't seen it. Pretty interesting article.
http://startingstrength.com/index.ph...aining_seniors
The author keeps her log on here so you could ping her about it via PM or something (
http://startingstrength.com/resource...ad.php?t=28028 )
I'm not in the field, but i'll just point out the obvious that (at least in the US, but i think most places) physical therapists are much much more credentialed than strength coaches/physical trainers and thus have more privileges and get paid more and are respected by the rest of the establishment (doctors, insurance companies, patients, etc. ) (That many of them are perhaps not very good at some things is another issue). Of course you have to go to school and jump through hoops to get those credentials and certifications.
Compared to that, becoming a trainer is a snap, but you are not, by default, respected by anyone. You might build your respect w/ some degrees and with experience and such, but from the point of view of "the establishment" you won't be much different than the 19yo working at 24 hour fitness teaching people how to do dumbell curls. Either way if you care about strength you'll have to learn it on your own as "the establishment" seems not so interested in it / not so good at it as has been mentioned in rants that come up in various places around here.