I am late getting into this conversation, so apologies.
I am 56 1/2 rodmaker, so we are alike in that regards.
I have grown my set-up slowly, and as a result have had the luxury of being able to adjust gradually as my numbers increased.
I have also had the insight through my inspection work the last 2 years, to be able to work and see how things can be, and are done on some commercial levels, and I can honestly say, and without any doubt, it is not for me. Absolutely no disrespect meant towards those that do it on that level, it is just not for me.
I consider myself truly fortunate to have stumbled across this thing of ours when I did (age 40), and often wish I had done so earlier in my life, things might have played out differently. But at my age, physical limits are indeed different, emotional and stress levels become more of an issue. I love what I do so much that I cannot comprehend jeoprodizing it and losing the joy of it by turning it into something more than what it is (if that makes any sense).
If things go badly for a year or two, will you have sufficient time to recover?
I do not wish to dampen enthusiasm for what may an opportunity of a lifetime, merely temper it with some views from a different angle.