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from 2005 through to 2012 I can say that I observed personally quite a large increase in the size of young teenagers (13-17)

in 2005 I purchased a bungee trampoline ride (where you get put in a harness and can then do flips etc aided by bungee cords)

the ride uses 3 sizes of harness with a degree of overlap between them

yellow (toddler up to around 10 years old)

red (10 years old upwards / up to around a 34 inch waist)

blue (anything over 32 inch waist)

in 2005 the ride operated 4 trampolines with 1 yellow, and 3 red harnesses (one of which was changed for blue if needed)

by 2012 the ride ran the same trampolines but now had to use 1 yellow, 1 red and 2 blue harnesses

over the years in between we saw no change in the age range that was being attracted to the ride (main demographic was 5 - 17 year olds with a distinct female bias) but did find that the sizes of harness we required was increasing year on year along with the number of potential customers that we had to turn away because they were simply too heavy for the ride or they physically would not fit in the largest harness