Yes! Commercial print agencies like FFT Models, and Cunningham Escott accept older models, mature models. To get an agency if you a mature model, adult models, or an older model, then...You want to find an agency that represents lifestyle models, not just kids, not just tall fashion models...but, commercial print models and woman of all ages. Don't go to fashion agencies. Only commercial print agencies. Even grandmothers can model and 40 is actually a prime age for modeling -many commercials and ads are targeted to that age group. Looking at Advertising is how you can find out what you can be modeling. You should approach brands you like yourself, or look for agencies by googling your home town + commercial print, if you are in a small city and it is a struggle to find an agency then take matters in to your own hands, magazines are based everywhere, even in small towns. Remember that magazines like home and garden, travel mags, readers digest, mother magazines, hair, and spa magazines need models of all ages. Why not send them your photos. Be bold, be innovative, promote yourself where you WANT to model. Or you can call up some magazines or modeling agencies and ask " which agencies represent mature or adult models." Becareful because the work Adult, can also mean porn. You want to find an agency that represents models for ads, commercials, and brands and magazines/ ranging in age.
I hope soon to have a list of agencies for each different area of modeling!