I am 61 years of age took my blood pressure this morning and it was 98/75 then i took it the second time and it was 104 /78 is this too low?

Not too low.: The top number may be little low for your age.

Many factors of BP: There are countless factors, including emotional, environmental, dietary, and internal that effect blood pressure. These readings are considered in a normal range but may be abnormal compared with your personal normals. They can be heavily effected if you are taking medication to control blood pressure. If feeling weakness, dizziness, chest pain, shortness of breath seek medical attention.