Find all $n$ such that there is a real polynomial $f(x)$ of degree $n$ such that $f(x) \ge f'(x)$ for all real $x$.
1. **Consider the case when \( n \) is even:**
   - Let \( n = 2k \) for some integer \( k \).
   - Define the polynomial \( f(x) = x^{2k} + c \), where \( c \) is a sufficiently large constant.
   - Compute the derivative: \( f'(x) = 2kx^{2k-1} \).
   - We need to show that \( f(x) \ge f'(x) \) for all \( x \in \mathbb{R} \).
   - Consider the difference \( f(x) - f'(x) = x^{2k} + c - 2kx^{2k-1} \).
   - For large \( c \), the term \( c \) dominates, ensuring \( f(x) - f'(x) \ge 0 \) for all \( x \).
   - Therefore, for even \( n \), there exists a polynomial \( f(x) \) such that \( f(x) \ge f'(x) \) for all \( x \).

2. **Consider the case when \( n \) is odd:**
   - Let \( n = 2k + 1 \) for some integer \( k \).
   - Suppose there exists a polynomial \( f(x) \) of degree \( n \) such that \( f(x) \ge f'(x) \) for all \( x \).
   - The polynomial \( f(x) - f'(x) \) is of degree \( n \) (since the degree of \( f'(x) \) is \( n-1 \)).
   - Since \( n \) is odd, \( f(x) - f'(x) \) is an odd-degree polynomial.
   - An odd-degree polynomial tends to \( -\infty \) as \( x \to -\infty \) and \( +\infty \) as \( x \to +\infty \).
   - Therefore, \( f(x) - f'(x) \) must take on negative values for some \( x \), contradicting \( f(x) \ge f'(x) \) for all \( x \).
   - Hence, there does not exist a polynomial \( f(x) \) of odd degree \( n \) such that \( f(x) \ge f'(x) \) for all \( x \).

Conclusion:
- For even \( n \), there exists a polynomial \( f(x) \) such that \( f(x) \ge f'(x) \) for all \( x \).
- For odd \( n \), no such polynomial \( f(x) \) exists.

The final answer is \( \boxed{ n } \) must be even.