If penile tissue has lost elasticity or has become scarred, is it still possible to attain erection?also under what circumstances can penis shrink?

Here's some...: The saying of "Don't use it or lose it." holds true for the penile erection. Aging comes along with impaired circulation and nerve function, and takes its toll to erectile function. However, quality healthy lifestyle without overindulgence and obsession may slow down the inevitable aging process. If ED becomes concern to you, seek professional evaluation and counseling timely so to deduce possible modifiable cause for reasonable Rx/ care.