SDET or Developer

Hi,

I am having 6+Years of SDET experience with C#.net testing tools. I have a career break recently due to rigorous work of working on 24x7. I want to start searching for job opportunities after a career break. I have below queries.

Can start working as a developer?
I am having 35 years of age will my age will be a factor of rejecting me as a developer with a development experience?
Will you please guide me about which tool i can learn and start working if age is not a factor?
I have trained on PowerBI tool shall i continue searching opportunities as a PowerBI developer?

Thanks & Regards,

G.V.Sunil