At age 65, you could have this much saved.
A common rule of thumb for retirement planning is the 4% Rule. This rule suggests that you can safely withdraw 4% of your portfolio in the first year of retirement (adjusted for inflation thereafter) without running out of money for at least 30 years. To find your "number," simply take your desired annual retirement income and multiply it by 25.
Time is your biggest asset. Due to compound interest, a person who saves $500/month starting at age 25 will often have more money at retirement than someone who saves $1,000/month starting at age 45. If you feel behind, the best time to start is today.