Is it normal for it to start taking longer to climax?

latley it's been taking longer to even get the sensation and then to get to my limaxIs it normal for it to start taking longer to climax?
Yes its normal for both men and women
Yes its normal for both women and men
You say 'lately', maybe you've been under a lot of stress lately or overworked; if your overall energy is low, so is your sexual energy. You might just be too tired to feel excited or reach an orgasm.
It can be age related, or medication/stress induced. Also any angry feelings toward your partner can play a part. ANY/ALL of those items are factors, so it's all ok, just be patient and ask your partner to go a little slower and it will all work out again :)