• Unable to have ejaculation?

I am a 77 year old male, I am diabetic type 2, otherwise in quite good health apart from osteoarthritis in my hips and knees. Within the past 6 months or so I am no longer able to ejaculate upon orgasm. My fiance is several years younger than me & I wish that I could complete our love life as per normal. Is it normal to be unable to ejaculate at my age and can anything be done to restore the complete menu?