It can be. Sometimes urinary incontinence is a symptom in the elderly; especially if incontinence was not an issue prior to the infection. Infection may irritate the lining of the bladder causing spasm and the subsequent leakage.
Yes. You may have urgency and incontinence during uti.
Yes. Yes bladder infection or cystitis can irritate the bladder muscle and you may "leak" urine.
Very common. Uti incontinence. It is more often in young girls.