Tristan und Isolde

This is supposed to be a tale of young lovers. The IMDb page of René Kollo, who plays Tristan, says he was born in '37, which would make him 46 when he made this. I think he's lying about his age - he looks like he's well into his 50's. His hair is obviously dyed. There was no information on Johanna Meir (sic) (I do believe her name is spelled Meier) on IMDb, but I googled her, and have found more than one source that says she was born in '38. That would make her 45. Ditto about the lying about the age (her, I'd say early 60's), and the dyed hair. They both have jowls! But still, Tristan and Isolde are supposed to be in their early 20's! I mean, Johanna is attractive in a matronly kind of way, but I think King Mark would be a little disappointed. Why didn't they have Hanna Schwarz, who plays Brangane, play Isolde? Her voice is just as good, and she's prettier, and even though her page says she was 40 when this was filmed, she looks about 30 (and 30 years younger than Johanna Meier). Not that this is the best literary material to draw from in the first place - it's a romanticization of adultery - but they just take 3 scenes from the story and then just stand in their respective places and sing - first about how much they hate each other and then about how much they love each other - for 81 min. per scene! And they sing about stuff that happened in the past and between scenes - why don't they act those parts out? I guess that's the fault of Wagner who wrote the thing, though, the Nazi. Only someone who knows the story will understand what's going on.