If a druid does not practice their craft over a period of 30 years can they lose their powers?

@chrisperkinsdnd may I ask a question please? If a druid does not practice their craft over a period of 30 years can they lose their powers?

— Mark-Alexander Cross (@CapricornCross) October 27, 2016

I don't believe so. #WOTCstaff https://t.co/kNxg5EMHej

— (((Chris Perkins))) (@ChrisPerkinsDnD) October 27, 2016