How to add columns to a dataframe without cutting off first row entry

Question

Suppose I have a csv file which looks like this:

Alice,23
Bob,45
Chuck,9
Daren,25
Elisa,16

When I read it using pandas with:

df = pd.read_csv('my_csv.csv')

It becomes a dataframe that looks like this:

    Alice   23
0     Bob   45
1   Chuck    9
2   Daren   25
3   Elisa   16

Then, when I want to rename the columns, i.e.

df.columns = ['name', 'age']

I get this:

     name  age
0     Bob   45
1   Chuck    9
2   Daren   25
3   Elisa   16

And as such, Alice of 23 years old is nowhere to be seen. What's the cleanest way to solve this issue? How to preserve the first data entry? Thanks!