I have searched and found forums about PE but nothing about having difficulty achieving orgasm. I can achieve erection and as intensity grows it feels I am approaching orgasm. Then the intensity just abates. Sometimes the erection is lost at that point but most times not, I just don’t achieve orgasm. This can happen repeatedly for an hour or more. Girlfriend is understandably happy but I need to achieve orgasm more easily. Is something wrong? It hasn’t always been this way, only the last year or so. I am 56 yrs old. Is this part of aging?