Though I have nothing against the use of Viagra or Cialis for what would be classified as recreational use, you should get your ED investigated. If you legitimately need a chemical aid to accomplish penetration, then Cialis may not be the best one.
My experience with orals is that they are expensive and that they are not always reliable. It is bad to pay for an erection, it is far worse to pay for it and then have it collapse at the worst possible time.
There are many specialists in the area of Erectile Dysfunction and age has no value in this one. It can happen at 18 or 80, with most men starting to have at least occasional problems by the time they reach their middle to late 40's.
After several years of hit and miss with orals I went on injectable and have never regretted it. It is cheaper than the pills and it gives me an erection to rival a teenager. I can go for hours!
Of the orals, Viagra has more side effects, is shorter lasting and is not as workable, but it tends to be stronger. Levitra has the same mechanism of action as Viagra. Cialis is the longest lasting, but, it also can be hit and miss. The one good thing is that Cialis is now also being examined in cardiac care as it has a positive benefit on coronary arteries.