I am an old dude with much model making and full sized boat designing experience. Mostly sail but some power boat models. I have a well equipped workshop and still have most of my fingers. I build mostly in wood, often high end ply. I am in my second childhood according to some of the observers when I am exercising my boats in a local lake. I have no patience will them but I am polite enough to agree that yes I am in my second childhood and enjoy playing with "toy" boats. Some of what I do with the models is observe behavior, power or sail requirements, eventual performance observations etc.
Full on high speed is not my cup of tea but I am OK with having my models going quickly. In the past I used nitro engines but I much prefer electrics these days. I live in Lakeland Florida where I can use my models almost year round.