I’m 62 and started flying nine years ago when I was forced into retirement at a major telco. I went from Private to CFII in eleven months at American Flyers at KSMO. Worked for them two years, started another CFI gig at KCMA, went to Surfair (Part 135) right seat in a PC-12 for two years and went back to instructing part time. That’s the key, part time. I can work as much or as little as I want when I want. Pay is about $30 an hour so you won’t get rich. I work with one or two clients at a time. There is a shortage of DPEs and instructors nationwide, pay has never been better. Go the 141 route, hate to say it but I do mostly instrument students and there is a vast knowledge difference between Private pilots who learned Part 61 vs. Part 141. I don’t have to reteach the basics to Part 141 trained pilots.