3 – unvisited playgrounds

THERE'S LITTLE sadder than outgrowing 
 Things we seldom thought to use. 
 Days are our one real currency, 
 These coins we either spend, or lose,  

Which, looking back, won't seem enough. 
 So take heed, when they're plenty, 
 And don't waste days you're gifted with, 
 You only get 

 So many