United Kingdom, May 5 -- Reba McEntire is amazed by her own longevity.

The 70-year-old country star is celebrating 50 years in the music industry, and Reba has admitted to being astonished by her own success.

Asked how she feels about reaching the milestone, Reba told People: "Very grateful, very thankful. And I never thought at the 20th anniversary that I'd be hitting this one. But I have to give a lot of credit to people who have been before me - Tammy [Wynette], Dolly [Parton], Loretta [Lynn] - who have paved the roads for girl singers of my generation and the ones that are coming up after me. So it's been a lot of fun.

"You always want to work real hard and make them proud."

Reba also credits God for her success and longevity.

Th...