Question 1165330
This is a percentage decrease calculation.

The formula for percentage less than (or percentage decrease) is:
$$\text{Percentage Less} = \frac{\text{Reference Value} - \text{Comparison Value}}{\text{Reference Value}} \times 100\%$$

In this case:

  * Reference Value (Men's age) $= 29.2$ years
  * Comparison Value (Women's age) $= 27.1$ years

$$\text{Percentage Less} = \frac{29.2 - 27.1}{29.2} \times 100\%$$

```python?code_reference&code_event_index=2
# Given values
men_age = 29.2
women_age = 27.1

# Calculate the percentage difference
percentage_less = ((men_age - women_age) / men_age) * 100

print(f"Percentage less: {percentage_less}")

```

```text?code_stdout&code_event_index=2
Percentage less: 7.191780821917801

```

The median age at first marriage of U.S. women (27.1 years) was approximately **7.19% less** than the median age for U.S. men (29.2 years) in 2015.

### Calculation Steps:

1.  **Find the Difference:**
    $$29.2 \text{ years} - 27.1 \text{ years} = 2.1 \text{ years}$$

2.  **Calculate the Percentage Decrease (using the men's age as the reference):**
    $$\text{Percentage Less} = \frac{\text{Difference}}{\text{Men's Age}} \times 100\%$$
    $$\text{Percentage Less} = \frac{2.1}{29.2} \times 100\%$$
    $$\text{Percentage Less} \approx 0.071917 \times 100\%$$
    $$\mathbf{\approx 7.19\%}$$