That is what happened to me.. after a couple months being a pharmacist, my dm offered me the manager position... Personally, I think it is a good idea only if..
1. you know your staffs (especially technicians) will support you at your store. (I had old tech who think she was so much better than their RPHs just bc she has been there longer so she can do whatever she wants... I spend time playing mind games with her too. kinda fun but at the end I moved so haha she was happy I left)
2. Your district manager is a nice and willing to help when you ask
3. Ask your DM if it is ok for you to step down in the future (My dm has his own personal policy where no managers can step own. Either quit or stay at the store... I think it is kinda stupid)
4. if you are up for a challenge.
But keep up the good work. Not everyone is offered the manager position. Your dm MUST see potential in you. You can always step down if it doesn't work out. So why not try only if 1,2,3,4 listed above.