I'm really tempted. We didn't have light-up shoes when I was a kid and I'm jealous! Is 45 too old for this sort of thing? 
Nope, No, and Nada!! Look, the way I see it if it makes you laugh, grin, chuckle, or feel giggly and full of fun, (and is legal) then who cares how old a person is?? If 80 year old men can leer openly at a pretty girl and get away with it, if granny's can jump out of airplanes and get on the front page of the paper, then you and I can darn well get light-up shoes and Heely's!! If people make negative comments, tell you to act your age, just stick your tongue out and say, "But dingdangity am I having FUN!!"
If you want them, get 'em. And have a blast of fun wearing them!
(FWIW, I still make snowmen in winter, cannonball off the dock into the lake in summer, and still swing around sign posts at the corners. I never want it to be said I didn't enjoy life!)
ETA: "dingdangity"

? I wrote the word meaning the big cement wall that holds back water, think Hoover!