Need a reality check by fellow firemedics

I'm looking at going back to Paramedic (again, thanks to NREMT not having grandfather clauses for deployed soldiers) and attend the fire academy as well in hopes of landing a paramedic job with a FD.  Problem is, I'll be 45 when I get done; any thoughts by fellow medics of whether this is even a possibility?  I've never worked fire, so I'm not sure what their policies are, even though there isn't a maximum age at many FDs, I have to be realistic.  I'm in great shape, and have about 15 years of EMS experience.