Reaching climax without ejaculation

I am in 50s and only very recently discovered this great pleasure of anal masturbation. Having read some stories over the internet, bought a prostate massager, but I enjoy to use it for anal penetration and masturbate. Now I have got sex toy (dildo) with a penis shape. My anal masturbation is in two stages. First penetrate prostate massage, play for about half hour, relax and then insert the dildo which is bigger and play in different positions. When I am done enough and feel tired, try to reach orgasm by inserting in and out very fast. I get a time like orgasm, but without ejaculation. I know if I ejaculate at the same time I would get the double pleasure. I like to reach the peak without ejaculation as it helps me to do it again and again, very frequently. Is this normal to keep going like this without ejaculate but with a sort of orgasm. Appreciate comments.