Having worked with certified sports-medicine trainers for the last few years, I will say that due to the industry being highly unregulated, just about anyone can call themselves a 'trainer.'
Ask for credentials- Don't just go by what they look like. Many, MANY guys juice their way into that body, which is complete and total bullshit for a healthy, sensible, long-term maintainable musculature.
Training just to 'get big' is the wrong way to go as you get older. You want to be core strong, flexible, heart healthy and to keep your body moving in the most efficient way possible.
That does not come from powerlifting.