*Loan,banking and credit>>>tax accounting

Upon retirement, are withdrawals from an ira account taxed as ordinary income?

Withdrawals are within the statutory limits.

a traditional ira will be taxed when you withdraw after 59 years of age. A roth ira will not be taxed as ordinary income as someone stated before thats including earnings and principle assuming you withdraw at the qualified age of 59 and a half.

If you withdraw before 59 there will be a 10% penalty. With a roth ira you can withdraw principle anytime with no penalty.

Yes, but you will be making less than when you were working - hence, a lower tax bracket.
If it was a traditional, deductible IRA, then the entire withdrawal is taxed as ordinary income. If it was a traditional, but nondeductible IRA, or a Roth IRA, then the withdrawal is taxed as ordinary income only to the extent that the withdrawal represents a withdrawal of the earnings of the IRA. Withdrawals of the contributions you made are not taxed (they were taxed before the contribution was made).