I realize the part is written for an older actress ie Ruth Gordon/Shirley Booth Carol Channing seemed to be the same age for decades just up until her last few years
Even though Donna Murphy is 60, she does play "young'
And yes, Barbra at 26 seems older than Lady Gaga is today at 32, so you are right JereNYC LG may be too young right now - and I'm sure she has so many other options
at this point in her career than re-making another Barbra Streisand vehicle - I could see Bette Midler doing it as a television event but a feature film would be too much like "Bette Midler" on the screen
than the character of Dolly Levi if that makes sense - even though from what I read that is what made the revival at the Shubert such an event