Im not overly sure about the morph but he looks young due to the marking on his back. Im guessing about 6-8 months old? He looks a bit like my leo which would make him a super hypo tangerine (SHT).
One thing I must say though is get rid of that subsrate right away. It looks like pink sand and sand is bad for your leo. often they will accidentaly swallow some whilst huting their prey. It can lead to impaction which will lead to death of your little friend. I use paper towel as it is safe, cheap to replace, doesnt harbour bacteria (coz it gets changed) and allows the correct temperature gradients.
Other people use Slate tile as this looks good also, but for a juvi i'd stick with paper towel.
Read throught the husbandry guides on this forum and you will see how bad sand and other loose substrates are.
Speraking of husbandry, how are your temps and everything? I didnt think a tank of this size would all the correct gradients. Leo's preferably need a long tank as apposed to a tall tank as they arent climbers they dont need the height.
I also didnt see any calcium in your tank? Its recommended that 100% calcium (w/o D3) is kept in the tank 24/7 for the leo to supliment himself.
I see you are a fellow Briton... Pets at home purchase or a local reptile shop?