Matthijs is very well dressed in this portrait as is Trijntje in a matching portrait. It appears they are doing well. Matthijs appears to be in his early 60s, suggesting a photo date of the early 1890s. One such date for both of them having a photo in that period was their 40th wedding anniversary, on November 15, 1891. At that date, Matthijs was 64 and Trijntje 59.
Of note, Matthijs has an unusual beard under his chin. It may have been the style of the times and may be useful in verifying the date suggested.
Dave Jordan took this photograph at Dick Denker's 1988 Vanderkloot Reunion in Crystal Lake, Illinois, from a photograph brought by Robert Vanderkloot of Michigan. If you would like to add information about this picture, please contact Dave Jordan, a 2x great-grandson of Matthijs and Trijntje Vanderkloot. The Picture Reference Number is Digitized Negative: 140-10.