Widower fears he will fail to satisfy younger love interest

¦ I am in my 60s and a widower. I was recently introduced to a very attractive woman in her late 50s, who is separated. We’ve gone on a few dates and things are going well.
At some point, the issue of sex is likely to be mentioned. I am afraid she might be disappointed by my performance. I suffer from premature ejaculation and have not had sex for five years. What do you suggest?