ROI for my age?

I am strongly considering joining the coaching training starting in April 2019. My question is, will I get an ROI? The reason I am asking is because I am 65, so I’ll be 66 when I finish. I’m considering that my niche be sort of my age group with an LDS values slant. Or the other niche I am considering is helping women dealing with betrayal trauma. I’m just wondering if there is a market for that type of niche. It’s a lot of money and time, ya know? I am currently a Real Estate agent, but ready to move on from that, but not ready or able actually to retire.