So you realise you are now the mom of my dream fish, right? I really want a dragon scale bi-color (blue/yellow) x marble HMPK. Since I know it exists and is alive, I am in total love with him.
Where did you buy him? I think most large chain pet stores like petsmart and petco get theirs from USA breeders which means he might be about 4-5 months old. One lps here gets theirs shipped from Malaysia and they come in closer to a year old. SO it's more up to an experienced breeder to give you a better accurate age than me. :)