He actually has someone who worked on the drug helping him. She's in the same situation, being stuck as a seven year old and living in hiding from the organization. But... she wasn't able to bring any of the research, so she's trying to work from memory. Meanwhile Conan is trying to investigate the organization.

Officially, the entire series takes place over a year, so he's probably not going to age much before he finally gets the cure. But since we're at 900+ episode now, the idea that the entire series is only taking place over a year keeps getting more and more silly.