Well you can stretch the bed til age 8-10 depending on how big your child is. Your boy will love the bed and might just sleep in it until he or she is until 13. It is all about personal preferences and all about whether or not your child will keep the bed.
The Little Tykes beds are sturdy and are built to last many years. When your child no longer comfortably fits on the mattress, you should upgrade the bed size.
I would say it might last your child til about 5 because any longer than that the bed might be uncomfortable. If your child is tall for their age then you might want to get them a different bed around 4 years old.
little tykes bed will last to age of five....it's very sturdy and funny looking definitely something kids would love to have it because of r has toy box in front...
This bed can last for decades, depending on how it is taken care of, of course. You son may outgrow it someday and need a larger bed such as a full size.